Snack means a threesome

Three friends got together to share cakes and tea. Actually, it's a hot girl and her boyfriend who ask their common female friend to join them for dinner. It turns out that friend is using her soft toes to tickle the guy underneath the table somewhere throughout the supper. The hostess of the house gradually loses her temper because she doesn't want anyone else to play around with her partner. The three friends' get-together evolves into a crazy threesome sex scene when, fortunately, she proves to be too sex-hungry to stop the argument.